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Data packet is used to communicate between the PC and the controller, in order to enhance the reliability of data, expanding capabilities to deal with images and other data.
a). PC sends a data packet to the controller.
b). The controller received the data packet, analysis it, processes the data packet, and then returns a data packet to the PC if necessary.
c). PC receives the data packets returned from the control card, and analysis the received data packets to determine whether the communication is successful.
Communication process using the packet data checksum to check the correctness of data transmission.